DICRANUM. 105 



similar, but rather smaller, more crowded and more irregular, 

 with somewhat sinuose walls, at back muriculate with strong, 

 rather distant, conical papilla? ; rough also at back of nerve. 

 Seta pale, rather short ; capsule rather broader than in D. Bergeri, 

 curved, irregularly sulcate when dry, with a short often strumulose 

 neck. 



Hab. Boggy heaths ; rare. Fr. late summer. 



Easily known from the next species by its leaves broader at the base and more 

 quickly acuminated, twisted when dry, papillose at back ; from all the other species 

 with undulate leaves by the small, irregular, papillose upper cells. It is a less distinct 

 plant in its habit than D. Bergeri, owing to the more convolute leaves with narrower 

 points, which bring it nearer to D. Bonjeani, but it is sufficiently marked to be quite 

 recognisable in the field by its much broader, more flaccid, and more rugose leaves 

 than the ordinary forms of that or any other species ; certain states of D. Bonjeani, 

 however, can hardly be separated except with the aid of the microscope. The nerve, 

 on the other hand, in the present plant is more yellow and conspicuous at the back of 

 the leaves than I have ever seen it in D. 



8. Dicranum Bergeri Bland. (D. Schraderi W. & M., Schp. 

 Syn.) (Tab. XVIII. A.). 



In large dense tufts, 2-6 inches high or more, dull green or 

 more usually bright yellowish green, robust, tomentose with brown 

 radicles. Leaves crowded, erect, and slightly spreading, hardly 

 secund, -when dry little changed, only very slightly flexuose, 

 strongly undulated and rugose, especially when dry ; slightly 

 widening upwards from the insertion as in the last species and 

 broadly ovate, rather quickly narrowing to an oblong or broadly 

 linear limb, somewhat obtuse at apex or obtusely pointed ; margin 

 slightly denticulate towards apex, but variable, sometimes almost 

 entire ; nerve narrow, vanishing below the point, faintly 

 denticulate or almost smooth at back, when dry conspicuous and 

 shining ; cells at angles orange brown, quadrate, forming 

 conspicuous auricles, narrow on each side of the nerve ; above 

 these a few cells are rectangular, the rest all narrow-linear, sinuose 

 with the pores of the cell walls, incrassate, gradually shorter 

 upwards, in upper part of leaf small, short, with incrassate walls, 

 irregular (rounded, quadrate, triangular, etc.), smooth at back. 

 Seta pale; capsule rather small, subcylindrical, curved, striate 

 when dry. Autoicous. 



Hab. Bogs on heaths. Very rare. Fr. autumn. 



Very distinct in its broad, rather obtuse, strongly undulated leaves, with short, 

 irregular areolation. From the last species it differs in its leaves less flexuose when 

 dry, less convolute above, and smooth at the back. The seta is rather longer, and 

 the capsule a little narrower. It resembles in habit Aulacomnium palustre more 



